How to analyse this data set?

Question

Mo Ba 2017-5-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/338614-how-to-analyse-this-data-set

编辑： KSSV 2017-5-4

Hello experts,

I have some data points and can easily plot them on a figure in MATLAB. For some reason, I need to find out what data points are located inside some rectangle areas as can be seen in attached picture. In this picture, black dots represent my data points and red rectangles represent mentioned areas. In this example, how can I search into my data points and see whether they belong to any rectangle or not? I need to have a list of all members (data points) for each rectangle. I hope I explained my problem clearly. Any idea and advice is appreciated.

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Answer 1

KSSV 2017-5-4

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/338614-how-to-analyse-this-data-set#answer_265567

编辑：KSSV 2017-5-4

在 MATLAB Online 中打开

doc inpolygon

N = 30 ;
[X,Y] = meshgrid(1:N,1:N) ;
plot(X,Y,'.k','markersize',10) ;
%%polygon coordinates
Rect = [ 8.5369   23.4840
   17.4539   23.4840
   17.5230   16.7493
    7.6382   16.4869
    8.5369   23.4840] ;
hold on
plot(Rect(:,1),Rect(:,2),'r');
%%get points inside the polygon
idx = inpolygon(X,Y,Rect(:,1),Rect(:,2)) ;
%%points inside polygon
xi = X(idx) ; yi = Y(idx) ;
plot(xi,yi,'ob')